Yeah, the pics showing the material assignment are not all clear. At least Simscale shows it in colors, though.
So now we have all the cases done with quad or hex elements.
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Case 2 ? I made it in 2D where the solver expands to these types of solids internally, but of course, there’s just one layer then (unless layered shells are used).
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Yes, I know. I did it for fun, to compare the results of different finite elements and to practice meshing 
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For heat transfer problems, linear elements are often sufficient (a rare case where C3D4 can be of any use), but second-order ones may still provide better results.
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